Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4576
CALL
Arrow Electronics
ARW
$10.5B
| $157K | ﹤0.01% |
1,100
-600
| -35% | -$74.7K |
|
4577
CALL
Ingevity
NGVT
$2.46B
| $157K | ﹤0.01% |
2,700
-800
| -23% | -$48K |
|
4578
PUT
Robert Half
RHI
$4.11B
| $157K | ﹤0.01% |
2,100
+1,600
| +320% | +$114K |
|
4579
CALL
Saic
SAIC
$4.95B
| $157K | ﹤0.01% |
+1,400
| New | +$145K |
|
4580
PUT
Champion Homes
SKY
$4.41B
| $157K | ﹤0.01% |
2,400
+1,600
| +200% | +$109K |
|
4581
PUT
ANI Pharmaceuticals
ANIP
$1.86B
| $156K | ﹤0.01% |
2,900
+2,800
| +2,800% | +$124K |
|
|
DCH
4582
Dauch Corp
DCH
$1.31B
| $156K | ﹤0.01% |
18,948
-3,233
| -15% | -$24K |
|
|
BLFY
4583
CALL
DELISTED
Blue Foundry Bancorp
BLFY
| $156K | ﹤0.01% |
+15,500
| New | +$149K |
|
4584
CALL
Brady Corp
BRC
$4.46B
| $156K | ﹤0.01% |
3,300
+2,700
| +450% | +$136K |
|
4585
Evercore
EVR
$11.8B
| $156K | ﹤0.01% |
1,269
+754
| +146% | +$86.7K |
|
4586
CALL
Lifestance Health
LFST
$4.15B
| $156K | ﹤0.01% |
17,100
+10,400
| +155% | +$86.4K |
|
|
PENG
4587
PUT
Penguin Solutions Inc
PENG
$2.24B
| $156K | ﹤0.01% |
5,400
-6,900
| -56% | -$138K |
|
|
MMAT
4588
CALL
DELISTED
Meta Materials Inc. Common Stock
MMAT
| $156K | ﹤0.01% |
7,288
-798
| -10% | -$19.2K |
|
|
ARGO
4589
CALL
DELISTED
Argo Group International Holdings, Ltd.
ARGO
| $156K | ﹤0.01% |
5,300
-1,700
| -24% | -$50K |
|
4590
CALL
Corebridge Financial
CRBG
$14.3B
| $155K | ﹤0.01% |
8,800
+8,000
| +1,000% | +$133K |
|
4591
Solid Power
SLDP
$450M
| $155K | ﹤0.01% |
61,191
-79,037
| -56% | -$182K |
|
|
SOND
4592
CALL
DELISTED
Sonder
SOND
| $155K | ﹤0.01% |
14,690
+2,385
| +19% | +$25.9K |
|
|
GTHX
4593
CALL
DELISTED
G1 Therapeutics, Inc. Common Stock
GTHX
| $155K | ﹤0.01% |
62,600
+32,500
| +108% | +$88.8K |
|
4594
PUT
Evolent Health
EVH
$371M
| $154K | ﹤0.01% |
5,100
+3,700
| +264% | +$120K |
|
|
EXK
4595
CALL
Endeavour Silver
EXK
$2.24B
| $154K | ﹤0.01% |
53,400
+15,800
| +42% | +$55.8K |
|
4596
Herc Holdings
HRI
$4.78B
| $154K | ﹤0.01% |
1,126
-1,809
| -62% | -$200K |
|
4597
CALL
Monro
MNRO
$414M
| $154K | ﹤0.01% |
3,800
| – | – |
|
4598
CALL
D-Wave Quantum Inc. Common Stock
QBTS
$5.99B
| $154K | ﹤0.01% |
+74,100
| New | +$81.6K |
|
|
4599
PUT
D-Wave Quantum Inc. Common Stock
QBTS
$5.99B
| $154K | ﹤0.01% |
73,900
+72,200
| +4,247% | +$79.5K |
|
|
SEE
4600
DELISTED
Sealed Air
SEE
| $154K | ﹤0.01% |
+3,858
| New | +$164K |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.